The six-girl team and their chaperone completed their journey just after midnight from their hometown of Herat, Afghanistan, to enter their ball-sorting robot in the three- day high school competition starting tomorrow in the US capital.
Awaiting them at the gate at Washington Dulles International Airport were a US special envoy and Afghan Ambassador Hamdullah Mohib, who described it as a rare moment of celebration for his beleaguered nation.
"Seventeen years ago, this would not have been possible at all," Mohib said in an interview. "They represent our aspirations and resilience despite having been brought up in a perpetual conflict. These girls will be proving to the world and the nation that nothing will prevent us from being an equal and active member of the international community."
Afghanistan isn't included in Trump's temporary travel ban, but critics have said the ban is emblematic of a broader effort to put a chill on Muslims entering the US.
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The girls' story has also renewed the focus on the longer-term US plans for aiding Afghanistan's future, as Trump's administration prepares a new military strategy that will include sending more troops to the country where the US has been fighting since 2001.
Trump's personal intervention earlier in the week using a rare "parole" mechanism to sidestep the visa system ended a dramatic saga in which the team twice traveled from their home in western Afghanistan through largely Taliban-controlled territory to Kabul, where their visa applications were denied twice.
The US won't say why the girls were rejected for visas, citing confidentiality. But Mohib said that based on discussions with US officials, it appears the girls were rebuffed due to concerns they would not return to Afghanistan.
It's a fate that has beset many Afghans seeking entry to the US in recent years as continuing violence and economic challenges lead many to seek asylum in America, or to travel through the US to Canada to try to resettle there.
Ultimately the State Department, which adjudicates visa applications, asked the Homeland Security Department to let them in on "parole," a temporary status used only in exceptional circumstances to let in someone who is otherwise ineligible to enter the country.
The US granted parole after determining that it constituted a "significant public benefit."
Ambassador Alice Wells, the acting US special envoy for Afghanistan and Pakistan, downplayed concerns that the girls might use the parole to stay in the US or go to Canada.
Competing against entrants from more than 150 countries, the girls will present a robot they devised that can recognise blue and orange and sort balls into correct locations.